Valve-gear for engines



(No Model.)

J. GRIME.

VALVE GEAR FOR ENGINES.

No. 335,578. PatentedFeb. 9, 1886.

Wiinea s e a 4 J71 Vania 7' 73 7 ffiw//cd fl-lfprney' UNITED STATES JOHNGRIME, OF MINNEAPOLIS, MINNESOTA.

VALVE-GEAR SPECIFICATION forming part of Letters Application filedNovember 12, 1885. Serial No. 182,562.

FOR ENGINES.

Patent No. 335,578, dated February 9, 1886.

(N0 model.)

To all whom it 11mg concern.-

Be it known that 1, JOHN GRIME, a citizen of the United States, residingat Minneapolis, in the county of Hennepin and State of Minnesota, haveinvented certain new and useful Improvements in Valve-Gear for Engines,of which the following is a specification.

My invention relates to valve-gear for locomotive-engines; and itsobjects are, first, the providing of devices for operating the valves bymeans of eccentrics on the axle of the driver; second, the constructionand arrangement of mechanism for producing equal portopenings andadmitting equal volumes of steam v for both forward and backward throwsof the valves; and, third, the construction of devices for adapting to alocomotive the class of valve-gear described in the patent granted to L.O. Lugmayr and myself October 28, 1884, N 0. 307,128. These objects areaccomplished by the mechanism illustrated in the accompanying drawings,in which- Figure 1 shows a side elevation of a driving-wheel and aportion of a locomotive provided with my improvements, and Figs. 2 and 3are detached views of the parts connected with the boiler and driveraxlefor supporting and actuating the valve-operating rods.

A represents the boiler; B, one of the driving-wheels of a locomotive,and b the driveraxle.

O is the rock-shaft, connected to and operated by levers in theengine-cab in the usual manner.

0 c are respectively a guide and slide-block similar to that shown anddescribed in an application for Letters Patent of the United Statesfiled by myself in the Patent Office August 15, 1885, and of the sameclass as that shown in the patent to Lugmayr and myself, abovementioned. The guide a is fastened to the end of the rock-shaft G, andthis shaft is supported above the axle b by a standard, D, boxed on theaxle b.

To prevent the standard D from turning, and at the same time to permitit to have vertical movement to correspond with the up and downmovements of the axle, there are provided on the upper portion of thestandard the slides d, operating between guides a. These guides are onbrackets a, which are secured to the lower side of the boiler; or

they may be supported from the engineframe when convenient, and theguides are adjustable horizontally by means of the setscrews o Themiddle portion of the standard D may be composed of two posts, d, and arod, 0, passed between them, with its ends secured to the lower portionsof the brackets a. By this means the brackets will be made firmer, andthe standard D prevented from sliding laterally on the axle b.

It will be apparent that by the arrangenected to it will be allowed tofollow the upward and downward movements of the driver-axle occasionedby unevenness of the roadbed,while the parts are prevented from shiftinglaterally by the brackets fixed to the boiler or frame.

F is an eccentric on the axle b, and its arm f is connected to theslide-block c by the pin 0 h is the eccentric-rod, connected to the armf by a pin, f, in a slot, f and its forward end is connected to theinner rocker-arm, 'm, and z is the valve-rod, connected to the outerrocker-arm, m. The rocker-arm m, to which the valve-rod is connected, ispreferably set in a vertical or nearly vertical position at mid-strokeof the valve, while the arm m, to which the eccentric-rod is connected,should incline from the arm m at an angle, which will cause the valvesto allow admission of equal volumes of steam through the ports for boththe forward and backward throws of the valves.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

1. In a valve-gear, the combination, with the driver-axle of alocomotive, of an eccentric on said axle, a standard boxed to said axle,a rock-shaft supported by said standard and carrying a guide, aslide-block operated in said guide by said eccentric, and guides forsaid standard supported independently of said axle, for permitting upand down movement corresponding with said axle and preventing lateralmovement of said standard, substantially as and for the purpose setforth.

2. In a locomotive valve-gear, the combination, with the driver-axle, ofa standard boxed thereon, guides for preventing lateral ment describedthe rock-shaft and parts con-- displacement of said standard, arocker-shaft the ether of said arms with the valves, subsnpported bysaid standard,a guide and slidestantiaily as described. block carried bsaid rockshaft, an eccentric T on said driver-aide and connected to saidslide- JOHL GRIME' 5 block, a rocker having arms set at an angle toVitnesses:

each other, a rod connecting said eccentric JULIUs E. MINER, with one ofsaid arms, and a rod connecting PATRICK H. GUNOKEL.

